Purrli: the website that plays an endless, lifelike cat purr

Purrli is a free website that does exactly one thing: it generates the sound of a cat purring, softly and without end. It is worth a look because that single, simple sound turns out to be one of the most calming noises on the internet, and Purrli builds it from a custom engine rather than a looped recording, so the purr keeps shifting and never quite repeats.

In brief

• Purrli, at purrli.com, is a free browser toy that plays an endless, gently changing cat purr, built by the sound engineer behind myNoise.
• The purr is generated live by a custom sound engine modelled on real cats, so it never loops and never plays the same second twice.
• A handful of sliders tune the cat's mood, closeness and volume, and a final slider even lets the cat nag you for attention.
• There is no account, no download and nothing to solve: people use it for calm, focus, sleep, and the comfort of a cat that is not there.

What Purrli actually is

Open purrli.com and a cat starts purring. There is no menu to click through first and no track to press play on. The sound is already running, a low and steady rumble that rises and falls the way a real cat's does when it settles on a lap. A short notice suggests headphones or proper speakers, because a phone's tiny speaker cannot carry the low end of a purr.

Below the purr sit a few labelled sliders and almost nothing else. The whole page is the cat and its controls. Purrli describes itself plainly, as an attempt "to recreate both the sound and the presence of your very own virtual cat." There is no score, no timer and no goal. A visitor simply leaves it running in a tab and lets the room fill with the sound of a contented animal.

How to tune your cat

The controls read like a personality test for an imaginary pet. One slider runs from Sleepy to Lively, another from Relaxed to Overjoyed, setting how energetic the purr feels. A Close to Distant slider moves the cat nearer or further, and a Purrfect to Meow-y control folds in the occasional small meow. Together they let a visitor dial in anything from a barely there hum to an insistent, happy engine.

The last slider is the mischievous one. Nudge it up and the cat begins to call for attention, adding little prompts as though it wants feeding or a stroke. Purrli warns about this directly, advising caution "if you don't want to be nagged in the middle of your work." It is a small, funny touch that captures something true about living with cats, and the kind of detail that separates a toy made with care from a stock sound loop.

The sound engine behind the purr

The reason Purrli holds up over long stretches is that it does not play a recording. It runs a custom sound engine that generates the purr in real time, modelled after real purrs, so the sound "delicately changes over time" and, in the site's own words, "NEVER repeats the same sound." A looped clip gives itself away within a minute; a living cat never does. Purrli aims for the second effect.

The default voice, named Babouche after Pigeon's own cat, is a warm and tranquil purr, with a young kitten and a gruffer, more crackling adult offered as alternative characters. Switching between them is like swapping one animal for another: the same idea, a different pet in the room.

Building a purr this way is harder than it sounds. A purr is not a clean tone but a textured, slightly irregular rumble, with tiny catches and variations that the ear reads as alive. Reproducing that without a recording means modelling the little imperfections on purpose, then varying them so no two moments line up. It is the same craft Pigeon brings to myNoise, where rain and wind are generated rather than sampled, so a listener can leave them running for hours without the tell-tale seam of a loop.

Why headphones matter

A purr is mostly low-frequency sound, and low frequencies are exactly what small speakers throw away. That is why Purrli opens by asking for headphones or external speakers: on a laptop grille, most of the purr's body simply vanishes, leaving a thin hiss. The fundamentals of a domestic cat's purr sit near the bottom of human hearing, roughly in the 20 to 30 hertz range, which is part of why it is felt as much as heard.

That the mechanism is real, not mystical, was underlined in 2023, when researchers reported in Current Biology that excised domestic-cat larynges could produce purr-frequency sounds on their own, without the continuous nerve signals long assumed to be necessary. Purrli makes no medical claim. It simply rebuilds, in software, a sound the body already finds easy to trust.

A single page, and a photo of your own cat

Visually, Purrli is almost aggressively plain, and that is the point. The default view is the controls over a soft background, but the site also offers a wallpaper mode and a picture mode that push the cat into a full-screen scene. A visitor can even load a photograph of their own cat, so the sound of a purr sits beneath a picture of the animal it is standing in for. On a second monitor or an old tablet, that turns any spare screen into a low-effort companion.

Nothing about the layout fights for attention. There are no pop-ups demanding a decision, no feed to scroll and no next thing queued up. The page loads, the cat purrs, and the interface recedes until a visitor wants to change something. In an era of websites engineered to keep people clicking, a page whose entire ambition is to be ignored while it works is quietly radical.

Who made Purrli, and why

Purrli is the work of Stéphane Pigeon, a Belgian sound engineer with a doctorate in applied sciences and a background in signal processing. He is best known for myNoise, a free background-noise generator he has run single-handedly since 2013, offering everything from rain and distant thunder to calibrated soundscapes for focus, relaxation and sleep. Purrli grew straight out of that project.

By Pigeon's account, myNoise users kept asking for a purring cat, and its audio engine was never built for that kind of sound. He eventually added a rough version anyway, called Furry Friend, and it became a surprise hit, passing a million plays. Unhappy with its limits, he built a dedicated engine from scratch and released it as Purrli. The launch was written up as a Show HN post on Hacker News in 2017, and the generator drew a second round of attention there again the following year.

myNoise itself is unusual for its seriousness. Pigeon calibrates each generator across ten frequency bands, so a listener can shape it to their own hearing and their own room, and he has kept the library free for personal use for over a decade. Purrli inherits that outlook: a small, exacting piece of audio engineering, given away, aimed at making an ordinary day a little more bearable.

What people actually use it for

Pigeon has said he first assumed a cat purr would be a gimmick, "something fun, but probably useless." The messages that followed changed his mind. Purrli now publishes a wall of user testimonials, and they are strikingly consistent: people reach for it in the hard moments, not the idle ones.

The commonest use is anxiety. Visitor after visitor describes turning the purr on during a panic attack and feeling their shoulders drop. Others use it to sleep, propping a phone under a pillow when the house is too quiet to settle in. A recurring, quietly moving theme is grief: people who have lost a cat, or cannot keep one, say the sound is close enough to sit with. Students away from home and workers missing a pet round out the picture.

What comes through those notes is not novelty but relief. The same words recur: calm, sleep, comfort, company. A gimmick would wear off, yet Purrli's users describe returning to it nightly, or keeping it running through a workday. The gap between what Pigeon expected and what he built is, in a way, the whole story of the site: a joke sound that turned out to do real work.

Why a fake purr is worth ten real minutes

The appeal of Purrli is the appeal of the calmer corners of the web in general. It asks for nothing, sells nothing urgent, and does its one thing well. A visitor is not being ranked, timed or nudged toward a purchase. There is only a sound, some sliders, and as much or as little attention as a person cares to give.

It also rewards being left alone. Unlike a song, the purr has no shape to anticipate and no ending to wait for, so the mind stops tracking it and simply relaxes into it. Ten minutes of a cat that does not exist, purring in the background while a difficult email gets written, is a genuinely useful trick, and a very cheap one.

There is something disarming, too, about the honesty of it. Purrli never pretends to be more than a sound. It does not promise productivity, gamify calm, or ask a visitor to build a streak. It offers a purring cat, notes that some people find it steadying, and leaves the rest alone. On a web that tends to oversell, a tool that undersells this gently is easy to trust.

Where it sits in the quiet web

Purrli belongs to a small family of single-purpose websites that offer one soothing thing and then get out of the way. That is the same instinct behind the hand-picked collection at boringwebsites.art, which gathers calm, single-minded corners of the web worth a few unhurried minutes.

Readers who like an ambient tab open will find kindred spirits in this blog's write-ups of Radio Garden, which tunes into live local stations across the world, and CacheMonet, which loops music and colour without end. For a broader tour, the roundup of useless websites to visit when bored maps out where a toy like this fits.

FAQ

What is Purrli?

Purrli is a free website, at purrli.com, that generates the sound of a cat purring and plays it for as long as a visitor leaves the tab open. The purr is produced live by a custom sound engine rather than looped from a clip, and a set of sliders adjusts the cat's mood, closeness and volume. There is no goal or score: the point is simply to have a calming, ever-changing purr on hand whenever it helps.

Is it free, and do I need an account?

Purrli is free and needs no account, download or sign-up. A visitor opens the page and the cat is already purring. The one practical requirement is decent audio: the site asks for headphones or external speakers, because the low frequencies that give a purr its comforting weight are lost on small phone and laptop speakers.

Is the purr a real recording of a cat?

No. Rather than replay a recorded clip, Purrli runs a custom sound engine that builds the purr in real time, modelled on real cats so it shifts continuously and, by the site's own account, never repeats the same sound. That is the whole design goal: a looped recording betrays itself within a minute, while a generated purr can stay convincing for hours.

Who made Purrli, and why?

It was built by Stéphane Pigeon, the Belgian sound engineer behind the free noise generator myNoise. After a rough cat purr he added to myNoise, called Furry Friend, unexpectedly passed a million plays, he built a dedicated engine and released it as Purrli, announced on Hacker News in 2017. His aim was a purr realistic enough to genuinely comfort the people who kept writing to ask for one.